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Image above: George "Pinky" Nelson flew three space shuttle missions, including STS-26. He also flew untethered in space using a Manned Maneuvering Unit. Photo credit: NASA
Image above: Bill Shepherd flew four times in space and served as the first commander of the International Space Station. Photo credit: NASA
Image above: James Wetherbee flew in space six times between 1990 and 2002, including five missions as commander. Four of his flights went to a space station, twice to Mir and twice to the International Space Station. Photo credit: NASA